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    CFD Analysis Of Jet Flows Ejected From Different Nozzles
    (Oxford University Press [University Publisher], 2021) Kosa, Ergin; Ezgi, Cüneyt; Berkay, Çetin; Atmaca, Mustafa
    Nozzles are widely used to control the rate of flow, speed, direction, mass, shape and pressure of the stream in connection with many different engineering applications. This paper presents the performance predicted by a computational fluid dynamic (CFD) model, which are 3D models that utilize parametric analysis, realizable k-epsilon turbulence models and experimental measurement for a jet. Jet flows are ejected from three different slot nozzles: round-shaped nozzle, rectangular-shaped nozzle and 2D-contoured nozzle. In this numerical study, velocities of free jets have been predicted for different axial distances from the nozzle exit in the range of 0.2?z/B?12 when center velocity at the nozzle exit. CFD simulation results are compared to experimental results from literature. These results are consistent with the existing experiments.
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    Energy Recovery Analysis in A-Type Pressure Regulation and Measurement Stations in Istanbul, Esenyurt
    (Institute of Physics of the Polish Academy of Sciences, 2019) Atmaca, Mustafa; Uraltaş, Yunus; Onat, Ayhan; Ezgi, Cüneyt
    Converting energy sources into electrical energy is as important as gaining energy. After producing natural gas, which is one of the most common energy sources and classified as fossil fuel, it is sold by the natural gas and petrol companies to the world by compressing it in the compressor stations. Gas companies compress incoming gas which is lost in the pipeline into 35–75 bar equal to the loss rate and transfer it to the A-type pressure regulation measurement stations. In these stations, natural gas that enters with high pressure is reduced to 12–19 bar by throttle valve. This process happens using the Joule–Thomson effect. Hence, no energy is produced in this process. There is a big waste of producible electrical energy in this situation. In this work, turboexpander which is suitable for radial type variant flow has been considered to be used instead of throttle valve at the stations. In this work, A-type pressure regulation measurement station in Esenyurt yearly gas values, inlet and outlet gas pressure values, inlet and outlet temperature values were searched and gained electric energy value was searched in case of installing turboexpander to this station.
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    Three-dimensional CFD modeling of a steam ejector
    (Taylor & Francis Inc, 2022) Atmaca, Mustafa; Ezgi, Cuneyt
    Steam ejectors are one of the key components of steam ejector refrigeration/heat pump systems. Steam ejector is required to compress low-pressure stream to a higher pressure. Steam ejectors have no moving part, a simple structure, low cost, reliability, easy installation, high vacuum performance, corrosion resistance, and no consumption of electrical energy. In this study, steam ejector design was modeled using finite volume techniques, and Mach number and pressure in constant cross-section have been compared with analytical data reported in the literature. In this work, numerical calculations were performed with ANSYS Fluent(ANSYS FLUENT Theory Guide, ANSYS, Inc. Release 17.2, 2016, Canonsburg, PA, USA), a computational fluid dynamic code. In the turbulent flow, heat transfer-based analyses were performed using energy equations.